and president obama is warning syria president over the entire situation. martha tonight on the weapon that syria has and what that means for the united states. >> latest intelligence is alar alarming. officials telling abc news the un is new seeing specific signs that the syrian regime may prosecute engine to use the chemical sarah against opposition forces. it is an extremely toxic substance that can kill a person in a matter of minutes. with only one dro drop. the victim suffocated from paralyzing effects of the toxin. this new intelligence has obama administration so concerned harsh warnings came today from the president himself. >> i want to make it absolutely clear to assad and those unhis command world is watching. use of chemical weapons is and would be totally unacceptable. if you make the tragic mistake of using these weapons there will be consequences and you will be held accountable. >>reporter: senior official tells abc news that there are contingent plans for military action if the weapons became a threat. syrian regime today said it wouldn't